13491231 has 16 divisors (see below), whose sum is σ = 19998720. Its totient is φ = 8033760.

The previous prime is 13491227. The next prime is 13491241. The reversal of 13491231 is 13219431.

It is not a de Polignac number, because 13491231 - 2² = 13491227 is a prime.

It is a super-2 number, since 2×13491231² = 364026627790722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13491211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4371 + ... + 6788.

It is an arithmetic number, because the mean of its divisors is an integer number (1249920).

Almost surely, 2^13491231 is an apocalyptic number.

13491231 is a deficient number, since it is larger than the sum of its proper divisors (6507489).

13491231 is a wasteful number, since it uses less digits than its factorization.

13491231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11206.

The product of its digits is 648, while the sum is 24.

The square root of 13491231 is about 3673.0411105785. The cubic root of 13491231 is about 238.0585913699.

The spelling of 13491231 in words is "thirteen million, four hundred ninety-one thousand, two hundred thirty-one".